Just put rear tubular shocks on my 49 half ton which had lever type. I measured and measured again but it seems I mounted the upper bracket a bit higher than on the stock later model trucks that had tubular. It puts the shock at a more vertical angle than original. It is now 45-55 degrees whereas stock was lower. Will this cause a problem? The ride is nice and the shocks are not binding anywhere. I understand that some common sense should be used when mounting shocks but it isn't rocket science.
You have a nice ride and no binding, what else could you want? Don't worry about it. Besides, it you are replacing lever-arm shocks with tubular airplane shocks there are no similarities at all.
Ride is improved but thought that because the shocks weren't lying at the same angle as later model years it would cause a problem.